Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d0c9414969f538…

MALICIOUS

PDF

80.6 KB Created: 2021-05-25 05:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fe27759648d57868a7ad44abe7c15a5c SHA-1: c947342e802193199553342203eec225b1a80f92 SHA-256: 29d0c9414969f538121d06e23ab7646166b261100254b923a1fccf684ea1e2c1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to 'Adjectives worksheets for class 4th', indicating a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=adjectives+worksheets+for+class+4th PDF link annotation
    • https://vepegusekukoj.weebly.com/uploads/1/3/4/4/134470637/sowumonikep.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/pubod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_605562fe2d25a.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/wedawirixajitapa.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/luviluzidupo_pajatejitefu_nudikiwas.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/8649205.pdfIn PDF document text
    • https://nenikekawudiw.weebly.com/uploads/1/3/4/4/134468161/wevakuti_sozasiwem_kuwalokilirer_zeriwimi.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/fukuzo.pdfIn PDF document text
    • https://wavarojejepifog.weebly.com/uploads/1/3/4/5/134590929/709370.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/d3395f1858cc.pdfIn PDF document text
    • https://nafejodibema.weebly.com/uploads/1/3/4/3/134318188/cc6ec4eb796f660.pdfIn PDF document text
    • https://fusonunobowur.weebly.com/uploads/1/3/0/8/130813531/zomogelosanoxato.pdfIn PDF document text
    • https://wezisaveveto.weebly.com/uploads/1/3/3/9/133999444/01fe008.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/7240870.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/4970353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fe174fe0203c.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/8207410.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/bixufozivaxot.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/bosifofidozivuforuwepifi.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/66393406899.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 5476 bytes
SHA-256: e2c57bc2ba64c57e4a27ce351cefd2e8d54ce50dcd44b8cbe91858cbefcc6898
font_01_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 11028 bytes
SHA-256: a0ae9dc764f0d12d1a7ee704e2c23b45791190632efe074e0920560a5efd31e9